I have a vtech 2.4 Ghz cordless phone that was advertised as "WiFi friendly" and it has co-existed with both b and g networks very well. I previously had a Panasonic 2.4 Ghz and it would dump the wireless network about one time out of three that the phone was used.

You can also reduce interference by running your computer network on Channel 11 (or 1) rather than the default Channel 6.